body{
	width:100%;
	height:100%;
	background-image: url(../img/bg.jpg); 
	background-position: center;
	background-size:cover;
	background-attachment: fixed;
	background-repeat: no-repeat;
	color: #fff;
}
.content{
	width:100%;
	height:100%;
	background: rgba(0,0,0,0.7);
	background-attachment: fixed;
	position: fixed;
	top:0;
	bottom:0;
	left:0;
	right:0;
	z-index: -1;
}
header{
	width:100%;
	height:60px;
	font-size: 30px;
	line-height: 60px;
	background: rgba(255,255,255,0.4);
}
.form-signin {
  max-width: 400px;
  padding: 10px 30px;
  margin: 50px auto;
  background: rgba(0,0,0,0.6);
}
.form-signin .form-signin-heading,
.form-signin .checkbox {
  margin-bottom: 10px;
}
.form-signin .checkbox {
  font-weight: normal;
}
.form-signin .form-control {
  position: relative;
  height: auto;
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
  padding: 10px;
  font-size: 16px;
}
.form-signin .form-control:focus {
  z-index: 2;
}
.form-signin input[type="text"] {
  margin-bottom: -1px;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
  margin-bottom: 20px;
}
.form-signin input[type="password"] {
  margin-bottom: 20px;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}
.code_img{
	width:20%;
	height:40px;
	margin-top:-10px;
	margin-bottom: 10px;
}
.btn-block{
	background: #259dab;
}
.code_img img{
	width:100%;
	height:100%;
}
/* ***************媒体查询**************************** */
